Allocate buffers of the right size when BT_HDR is included

Bug: 63146105
Test: External script
Change-Id: I1f2c871e3fcf57aabdad9d07905e6dae643bd496
Merged-In: I1f2c871e3fcf57aabdad9d07905e6dae643bd496
(cherry picked from commit d88838a7237cd672d87b6b9cc8d56fff625fd1d5)
(cherry picked from commit b648c7dfe45c57842d58576f558fdf8edff10bec)
(cherry picked from commit 338e0485940ab278e6a2dc12285ba0798b79cfa4)
4 files changed